Removing config.db lets me start mnemosyne as normal. However trying to
change, the font size or font type leads to crashes.
I have an example here below:

coolens@antec2:~$ mnemosyne
qt.webenginecontext:

GL Type: desktop
Surface Type: OpenGL
Surface Profile: CompatibilityProfile
Surface Version: 4.6
QSG RHI Backend: OpenGL
Using Supported QSG Backend: yes
Using Software Dynamic GL: no
Using Multithreaded OpenGL: yes

Init Parameters:
  *  application-name Mnemosyne
  *  browser-subprocess-path
/home/coolens/.local/lib/python3.10/site-packages/PyQt6/Qt6/libexec/QtWebEngineProcess

  *  create-default-gl-context
  *  disable-features
ConsolidatedMovementXY,InstalledApp,BackgroundFetch,WebOTP,WebPayments,WebUSB,PictureInPicture

  *  disable-setuid-sandbox
  *  disable-speech-api
  *  enable-features NetworkServiceInProcess,TracingServiceInProcess
  *  enable-threaded-compositing
  *  in-process-gpu
  *  use-gl desktop

Log body:
 An unexpected error has occurred.
Please forward the following info to the developers:

Traceback (innermost last):
  File "/usr/local/bin/mnemosyne", line 4, in <module>
    __import__('pkg_resources').run_script('Mnemosyne==2.10', 'mnemosyne')
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line
656, in run_script
    self.require(requires)[0].run_script(script_name, ns)
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line
1453, in run_script
    exec(code, namespace, namespace)
  File
"/usr/local/lib/python3.10/dist-packages/Mnemosyne-2.10-py3.10.egg/EGG-INFO/scripts/mnemosyne",
line 312, in <module>
    mnemosyne.initialise(data_dir=data_dir, filename=filename,
  File
"/usr/local/lib/python3.10/dist-packages/Mnemosyne-2.10-py3.10.egg/mnemosyne/libmnemosyne/__init__.py",
line 462, in initialise
    self.start_review()
  File
"/usr/local/lib/python3.10/dist-packages/Mnemosyne-2.10-py3.10.egg/mnemosyne/libmnemosyne/__init__.py",
line 584, in start_review
    self.controller().set_study_mode(self.study_mode_with_id(\
  File
"/usr/local/lib/python3.10/dist-packages/Mnemosyne-2.10-py3.10.egg/mnemosyne/libmnemosyne/controllers/default_controller.py",
line 114, in set_study_mode
    study_mode.activate()
  File
"/usr/local/lib/python3.10/dist-packages/Mnemosyne-2.10-py3.10.egg/mnemosyne/libmnemosyne/study_modes/scheduled_forgotten_new.py",
line 23, in activate
    self.review_controller().reset(new_only=False)
  File
"/usr/local/lib/python3.10/dist-packages/Mnemosyne-2.10-py3.10.egg/mnemosyne/libmnemosyne/review_controllers/SM2_controller.py",
line 53, in reset
    self.show_new_question()
  File
"/usr/local/lib/python3.10/dist-packages/Mnemosyne-2.10-py3.10.egg/mnemosyne/libmnemosyne/review_controllers/SM2_controller.py",
line 115, in show_new_question
    self.update_dialog()
  File
"/usr/local/lib/python3.10/dist-packages/Mnemosyne-2.10-py3.10.egg/mnemosyne/libmnemosyne/review_controllers/SM2_controller.py",
line 196, in update_dialog
    self.update_qa_area(redraw_all)
  File
"/usr/local/lib/python3.10/dist-packages/Mnemosyne-2.10-py3.10.egg/mnemosyne/libmnemosyne/review_controllers/SM2_controller.py",
line 228, in update_qa_area
    w.set_question(self.card.question(self.render_chain))
  File
"/usr/local/lib/python3.10/dist-packages/Mnemosyne-2.10-py3.10.egg/mnemosyne/libmnemosyne/card.py",
line 96, in question
    return self.card_type.render_question\
  File
"/usr/local/lib/python3.10/dist-packages/Mnemosyne-2.10-py3.10.egg/mnemosyne/libmnemosyne/card_type.py",
line 76, in render_question
    return self.render_chain(render_chain).\
  File
"/usr/local/lib/python3.10/dist-packages/Mnemosyne-2.10-py3.10.egg/mnemosyne/libmnemosyne/render_chain.py",
line 153, in render_question
    return self._render(card, fact_keys, decorators, **render_args)
  File
"/usr/local/lib/python3.10/dist-packages/Mnemosyne-2.10-py3.10.egg/mnemosyne/libmnemosyne/render_chain.py",
line 178, in _render
    fact_data[fact_key] = filter.run(fact_data[fact_key],
  File
"/usr/local/lib/python3.10/dist-packages/Mnemosyne-2.10-py3.10.egg/mnemosyne/libmnemosyne/filters/non_latin_font_size_increase.py",
line 52, in run
    base_font_size = self.main_widget().default_font_size()
  File
"/usr/local/lib/python3.10/dist-packages/Mnemosyne-2.10-py3.10.egg/mnemosyne/pyqt_ui/main_wdgt.py",
line 120, in default_font_size
    return QtWidgets.qApp.font().pointSize()
 AttributeError: module 'PyQt6.QtWidgets' has no attribute 'qApp'

An unexpected error has occurred.
Please forward the following info to the developers:

Traceback (innermost last):
  File "/usr/local/bin/mnemosyne", line 4, in <module>
    __import__('pkg_resources').run_script('Mnemosyne==2.10', 'mnemosyne')
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line
656, in run_script
    self.require(requires)[0].run_script(script_name, ns)
  File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line
1453, in run_script
    exec(code, namespace, namespace)
  File
"/usr/local/lib/python3.10/dist-packages/Mnemosyne-2.10-py3.10.egg/EGG-INFO/scripts/mnemosyne",
line 312, in <module>
    mnemosyne.initialise(data_dir=data_dir, filename=file

On Mon, 24 Jul 2023 at 11:33, Peter Bienstman <[email protected]>
wrote:

> Hi,
>
> Try deleting config.db and try again. Let me know if the problem persists.
>
> Cheers,
>
> Peter
>
> On Mon, Jul 24, 2023 at 11:26 AM Hugo Coolens <[email protected]>
> wrote:
> >
> > Dear all,
> > I tried to increase the font size for non-latin characters with three
> pixels using the settings menu, I got a list of errors after doing that,
> and now every time I try to start mnemosyne I'm getting the attached error
> message window. How can I get mnemosyne back to work?
> >
> > kind regards,
> > hugo
> >
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